In airplanes, engine mounting structures have two primary performances: 1-They sustain all loads which engines produces or those which are exerted on engines in different maneuvering conditions. 2-They make the thrust load and the centric line of its containing cabin concentric . In this paper, analysis of a mounting engine structure with the purpose of the accurate adjustment of the engine in its cabin is presented. Some sample diagrams, which introduced ideal adjustment angles for a specific aircraft, is proposed. These diagrams are obtained with the help of a MATLAB program that can be used for any dimension of the engine and cabin. Therefore, with the aid of these diagrams or this code, the time of adjustment the engine in its cabin will be decreased so much.